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Latest firefox update has turned browser to slow and laggy

  • 25 பதிலளிப்புகள்
  • 142 இந்த பிரச்னைகள் உள்ளது
  • Last reply by the-edmeister


I had an automatic update install to firefox around 2 weeks ago. Since then it has gone from being the best and fastest browser on my computer to the slowest.

Even just typing this message there is a massive lag between me typing and it appearing on screen. Prior to the update it used to run perfectly. If I try and clear the search bar to type in a new address it can take 5 - 10 seconds or won't do it at all so I end up typing into what's already there! Basically every action I take with keyboard or mouse has a delay attached to it.

I have so far tried to reset Firefox option which has made no difference.

Am running Windows 7 Service Pack 1 with 4 GB of RAM. Over half of hard drive space remaining.Chrome which I also have on my PC is running perfectly normal. If possibly I'd like to carry on using firefox! :-)

Thanks for any help.

தீர்வு தேர்ந்தெடுக்கப்பட்டது

ok, thanks martin. nothing in particular is coming to mind there. however two things you could try is to 1. update your graphics driver: and 2. your plugins:

please report if this makes any difference.

Read this answer in context 👍 4

All Replies (20)

hello, can you try to replicate this behaviour when you launch firefox in the built-in safe mode once for testing purposes?

Troubleshoot extensions, themes and hardware acceleration issues to solve common Firefox problems


Thanks for the reply,

Just tried in safe mode and issue is still the same,


ok, could you go to the firefox menu ≡ > help ? > troubleshooting information, copy the contents of that page and paste them here into a reply on the forum? this might help figuring out what is going on...

Thanks again for your help,

Here is the pasted information:

Application Basics

Name: Firefox Version: 32.0.3 User Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:32.0) Gecko/20100101 Firefox/32.0

Crash Reports for the Last 3 Days

All Crash Reports (including 2 pending crashes in the given time range)


Name: HP Smart Web Printing Version: 4.60 Enabled: false ID:

Name: Wondershare Video Converter Ultimate Version: 6.0.0 Enabled: false ID: {8D150B8F-EFE8-45a3-A4A3-053020F48FAC}


Adapter Description: ATI Radeon HD 4200 Adapter Drivers: atiumd64 atidxx64 atiumdag atidxx32 atiumdva atiumd6a atitmm64 Adapter RAM: 256 ClearType Parameters: Gamma: 1800 Pixel Structure: R ClearType Level: 100 Enhanced Contrast: 50 Device ID: 0x9710 Direct2D Enabled: true DirectWrite Enabled: true (6.1.7601.17563) Driver Date: 7-14-2009 Driver Version: 8.640.0.0 GPU #2 Active: false GPU Accelerated Windows: 1/1 Direct3D 10 Vendor ID: 0x1002 WebGL Renderer: Google Inc. -- ANGLE (ATI Radeon HD 4200 Direct3D9Ex vs_3_0 ps_3_0) windowLayerManagerRemote: false AzureCanvasBackend: direct2d AzureContentBackend: direct2d AzureFallbackCanvasBackend: cairo AzureSkiaAccelerated: 0

Important Modified Preferences

browser.cache.disk.capacity: 358400 browser.cache.disk.smart_size.first_run: false browser.cache.disk.smart_size.use_old_max: false browser.cache.frecency_experiment: 1 browser.places.smartBookmarksVersion: 7 browser.sessionstore.upgradeBackup.latestBuildID: 20140923175406 browser.startup.homepage_override.buildID: 20140923175406 browser.startup.homepage_override.mstone: 32.0.3 dom.mozApps.used: true extensions.lastAppVersion: 32.0.3 gfx.direct3d.last_used_feature_level_idx: 0 keyword.URL: network.cookie.prefsMigrated: true places.database.lastMaintenance: 1412081660 places.history.expiration.transient_current_max_pages: 100637 plugin.disable_full_page_plugin_for_types: application/pdf plugin.importedState: true print.printer_HP_Photosmart_Prem_C310_series.print_bgcolor: false print.printer_HP_Photosmart_Prem_C310_series.print_bgimages: false print.printer_HP_Photosmart_Prem_C310_series.print_colorspace: print.printer_HP_Photosmart_Prem_C310_series.print_command: print.printer_HP_Photosmart_Prem_C310_series.print_downloadfonts: false print.printer_HP_Photosmart_Prem_C310_series.print_duplex: 1515870810 print.printer_HP_Photosmart_Prem_C310_series.print_edge_bottom: 0 print.printer_HP_Photosmart_Prem_C310_series.print_edge_left: 0 print.printer_HP_Photosmart_Prem_C310_series.print_edge_right: 0 print.printer_HP_Photosmart_Prem_C310_series.print_edge_top: 0 print.printer_HP_Photosmart_Prem_C310_series.print_evenpages: true print.printer_HP_Photosmart_Prem_C310_series.print_footercenter: print.printer_HP_Photosmart_Prem_C310_series.print_footerleft: &PT print.printer_HP_Photosmart_Prem_C310_series.print_footerright: &D print.printer_HP_Photosmart_Prem_C310_series.print_headercenter: print.printer_HP_Photosmart_Prem_C310_series.print_headerleft: &T print.printer_HP_Photosmart_Prem_C310_series.print_headerright: &U print.printer_HP_Photosmart_Prem_C310_series.print_in_color: true print.printer_HP_Photosmart_Prem_C310_series.print_margin_bottom: 0.5 print.printer_HP_Photosmart_Prem_C310_series.print_margin_left: 0.5 print.printer_HP_Photosmart_Prem_C310_series.print_margin_right: 0.5 print.printer_HP_Photosmart_Prem_C310_series.print_margin_top: 0.5 print.printer_HP_Photosmart_Prem_C310_series.print_oddpages: true print.printer_HP_Photosmart_Prem_C310_series.print_orientation: 0 print.printer_HP_Photosmart_Prem_C310_series.print_page_delay: 50 print.printer_HP_Photosmart_Prem_C310_series.print_paper_data: 9 print.printer_HP_Photosmart_Prem_C310_series.print_paper_height: 11.00 print.printer_HP_Photosmart_Prem_C310_series.print_paper_name: print.printer_HP_Photosmart_Prem_C310_series.print_paper_size_type: 0 print.printer_HP_Photosmart_Prem_C310_series.print_paper_size_unit: 1 print.printer_HP_Photosmart_Prem_C310_series.print_paper_width: 8.50 print.printer_HP_Photosmart_Prem_C310_series.print_plex_name: print.printer_HP_Photosmart_Prem_C310_series.print_resolution: 1515870810 print.printer_HP_Photosmart_Prem_C310_series.print_resolution_name: print.printer_HP_Photosmart_Prem_C310_series.print_reversed: false print.printer_HP_Photosmart_Prem_C310_series.print_scaling: 1.00 print.printer_HP_Photosmart_Prem_C310_series.print_shrink_to_fit: true print.printer_HP_Photosmart_Prem_C310_series.print_to_file: false print.printer_HP_Photosmart_Prem_C310_series.print_unwriteable_margin_bottom: 0 print.printer_HP_Photosmart_Prem_C310_series.print_unwriteable_margin_left: 0 print.printer_HP_Photosmart_Prem_C310_series.print_unwriteable_margin_right: 0 print.printer_HP_Photosmart_Prem_C310_series.print_unwriteable_margin_top: 0 privacy.sanitize.migrateFx3Prefs: true storage.vacuum.last.index: 1 storage.vacuum.last.places.sqlite: 1411739324


Incremental GC: true


Activated: false Prevent Accessibility: 0

Library Versions

NSPR Expected minimum version: 4.10.6 Version in use: 4.10.6

NSS Expected minimum version: 3.16.5 Basic ECC Version in use: 3.16.5 Basic ECC

NSSSMIME Expected minimum version: 3.16.5 Basic ECC Version in use: 3.16.5 Basic ECC

NSSSSL Expected minimum version: 3.16.5 Basic ECC Version in use: 3.16.5 Basic ECC

NSSUTIL Expected minimum version: 3.16.5 Version in use: 3.16.5

Experimental Features

தீர்வு தேர்ந்தெடுக்கப்பட்டது

ok, thanks martin. nothing in particular is coming to mind there. however two things you could try is to 1. update your graphics driver: and 2. your plugins:

please report if this makes any difference.

Worked :-)

Followed all instructions and updated plugins, then updated graphics drivers. Not sure which did the track but firefox back to running nice and smooth... so no need to switch to Chrome!!!

Thanks for your time,


I'm experiencing the same issue. I'm experiencing similar keyboard input events being very slow to be processed, with FF 33.02 on windows 7. This was also reported independently by other users into

I'm experiencing this lag when using the address bar, or using web sites (e.g. google docs) which become unuseable. Not better after starting from a fresh profile, updating all plugins, I tried resetting firefox without more luck.

I thought it could come from by computer, but the problem does not reproduce in chrome or other windows apps, only in FF

The problem is caused by the new "off main thread composition" feature which was enabled in Firefox 33. You can disable this in the Firefox preferences by changing the value of layers.offmainthreadcomposition.enabled to false.

I opened the bug you mentioned two weeks before the release of Firefox 33, but never received any feedback. I even sent an email directly to the developer but didn't receive an answer. It gives the impression, that the developer is not interested in feedback.

Thanks testit. The workaround of disabling "off main thread composition" by changing the value of layers.offmainthreadcomposition.enabled to false, indeed solved my issue.

Sorry to hear your warning to FF developers were not heard and this bug slipped through FF users. I hope this can improve in the future.

Thanks again for sharing this workaround and for trying to prevent the bug to be introduced in FF 33.

@gberche: could you post your troubleshooting information too? maybe this can show some similarities between your set-ups...

in addition please run a scan with adwcleaner and free version of malwarebytes for testing purposes. i have seen a few omtc-releated graphic glitches reported by other users that turned out to be caused by malware (they had other symptoms like you're describing though, so this is just to play safe...)

tried the solution above from testit without sucess issue still persists, will paste trouble shooting info in next posts as it appears to be too long for a single post

dwarde_2000 மூலமாக திருத்தப்பட்டது

Application Basics

Firefox Version: 33.0.2 User Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:33.0) Gecko/20100101 Firefox/33.0 Multiprocess Windows: 0/1 Crash Reports for the Last 3 Days

All Crash Reports Extensions

Adblock Plus Version: 2.6.5 Enabled: true ID: {d10d0bf8-f5b5-c8b4-a8b2-2b9879e08c5d}

Auto Refresh Version: 1.0.2 Enabled: true ID: autorefresh@plugin

avast! Online Security Version: 9.0.2021.112 Enabled: true ID:

BetterPrivacy Version: 1.68 Enabled: true ID: {d40f5e7b-d2cf-4856-b441-cc613eeffbe3}

CoolPreviews Version: 4.5 Enabled: true ID: {CE6E6E3B-84DD-4cac-9F63-8D2AE4F30A4B}

Forecastfox Version: 2.2.2 Enabled: true ID: {0538E3E3-7E9B-4d49-8831-A227C80A7AD3}

FoxClocks Version: 3.4.14 Enabled: true ID: {d37dc5d0-431d-44e5-8c91-49419370caa1}

Garmin Communicator Version: 4.1.0 Enabled: true ID: {195A3098-0BD5-4e90-AE22-BA1C540AFD1E}

Ghostery Version: 5.4.1 Enabled: true ID:

Google Shortcuts Version: Enabled: true ID: {5C46D283-ABDE-4dce-B83C-08881401921C}

Google Translator for Firefox Version: Enabled: true ID: translator@zoli.bod

IE Tab Plus Version: Enabled: true ID:

Name: LastPass Version: 3.1.54 Enabled: true ID:

Less Spam, please Version: 0.8.0 Enabled: true ID:

Open in IE Version: 1.4 Enabled: true ID:

Padlock Version: 0.5.0 Enabled: true ID: {d09e32df-8610-4b33-b929-1e631b764130}

RealDownloader Version: 17.0.13 Enabled: true ID: {9D2AA73B-6049-4799-B8AC-925723370070}

Restart Button Version: 0.1.5 Enabled: true ID:

Restart Firefox Version: 0.5 Enabled: true ID:

Session Manager Version: Enabled: true ID: {1280606b-2510-4fe0-97ef-9b5a22eafe30}

Tab Utilities Version: Enabled: true ID:

Troubleshooter Version: 1.1a Enabled: true ID:

Twitter_Autorefresh Version: 0.3 Enabled: true ID: jid1-3P6ZUb9u2yIOjg@jetpack

WOT Version: 20131118 Enabled: true ID: {a0d7ccb3-214d-498b-b4aa-0e8fda9a7bf7}

PDF Download Version: Enabled: false ID: {37E4D8EA-8BDA-4831-8EA1-89053939A250}


Adapter Description: NVIDIA GeForce 210 Adapter Drivers: nvd3dumx,nvwgf2umx,nvwgf2umx nvd3dum,nvwgf2um,nvwgf2um Adapter RAM: 512 ClearType Parameters: Gamma: 2200 Pixel Structure: R ClearType Level: 100 Enhanced Contrast: 400 Device ID: 0x0a65 Direct2D Enabled: true DirectWrite Enabled: true (6.2.9200.16571) Driver Date: 7-2-2014 Driver Version: GPU #2 Active: false GPU Accelerated Windows: 1/1 Direct3D 10 Vendor ID: 0x10de windowLayerManagerRemote: false AzureCanvasBackend: direct2d AzureContentBackend: direct2d AzureFallbackCanvasBackend: cairo AzureSkiaAccelerated: 0

Important Modified Preferences

accessibility.typeaheadfind.flashBar: 0 browser.cache.disk.capacity: 358400 browser.cache.disk.smart_size_cached_value: 358400 browser.cache.disk.smart_size.first_run: false browser.cache.disk.smart_size.use_old_max: false browser.cache.frecency_experiment: 4 browser.places.smartBookmarksVersion: 7 true browser.sessionstore.upgradeBackup.latestBuildID: 20141027150301 browser.startup.homepage: about:home browser.startup.homepage_override.buildID: 20141027150301 browser.startup.homepage_override.mstone: 33.0.2 browser.tabs.loadInBackground: false browser.tabs.onTop: false dom.mozApps.used: true dom.w3c_touch_events.expose: false extensions.lastAppVersion: 33.0.2 font.internaluseonly.changed: true gfx.direct3d.last_used_feature_level_idx: 0 gfx.direct3d.prefer_10_1: true keyword.URL: layers.offmainthreadcomposition.enabled: false media.gmp-gmpopenh264.lastUpdate: 1414685940 media.gmp-gmpopenh264.version: 1.1 media.gmp-manager.lastCheck: 1414685939 network.cookie.prefsMigrated: true places.database.lastMaintenance: 1414686666 places.history.expiration.transient_current_max_pages: 104858 places.history.expiration.transient_optimal_database_size: 167772160 plugin.disable_full_page_plugin_for_types: application/vnd.adobe.xfdf,application/vnd.fdf,application/vnd.adobe.xdp+xml,,application/pdf plugin.importedState: true plugin.state.nppdf: 2 print.print_printer: Canon Inkjet MP610 series print.printer_Canon_Inkjet_MP610_series.print_bgcolor: false print.printer_Canon_Inkjet_MP610_series.print_bgimages: false print.printer_Canon_Inkjet_MP610_series.print_command: print.printer_Canon_Inkjet_MP610_series.print_downloadfonts: false print.printer_Canon_Inkjet_MP610_series.print_edge_bottom: 0 print.printer_Canon_Inkjet_MP610_series.print_edge_left: 0 print.printer_Canon_Inkjet_MP610_series.print_edge_right: 0 print.printer_Canon_Inkjet_MP610_series.print_edge_top: 0 print.printer_Canon_Inkjet_MP610_series.print_evenpages: true print.printer_Canon_Inkjet_MP610_series.print_footercenter: print.printer_Canon_Inkjet_MP610_series.print_footerleft: &PT print.printer_Canon_Inkjet_MP610_series.print_footerright: &D print.printer_Canon_Inkjet_MP610_series.print_headercenter: print.printer_Canon_Inkjet_MP610_series.print_headerleft: &T print.printer_Canon_Inkjet_MP610_series.print_headerright: &U print.printer_Canon_Inkjet_MP610_series.print_in_color: true print.printer_Canon_Inkjet_MP610_series.print_margin_bottom: 0.5 print.printer_Canon_Inkjet_MP610_series.print_margin_left: 0.5 print.printer_Canon_Inkjet_MP610_series.print_margin_right: 0.5 print.printer_Canon_Inkjet_MP610_series.print_margin_top: 0.5 print.printer_Canon_Inkjet_MP610_series.print_oddpages: true print.printer_Canon_Inkjet_MP610_series.print_orientation: 0 print.printer_Canon_Inkjet_MP610_series.print_page_delay: 50 print.printer_Canon_Inkjet_MP610_series.print_paper_data: 9 print.printer_Canon_Inkjet_MP610_series.print_paper_height: 11.00 print.printer_Canon_Inkjet_MP610_series.print_paper_size_type: 0 print.printer_Canon_Inkjet_MP610_series.print_paper_size_unit: 1 print.printer_Canon_Inkjet_MP610_series.print_paper_width: 8.50 print.printer_Canon_Inkjet_MP610_series.print_reversed: false print.printer_Canon_Inkjet_MP610_series.print_scaling: 1.00 print.printer_Canon_Inkjet_MP610_series.print_shrink_to_fit: true print.printer_Canon_Inkjet_MP610_series.print_to_file: false print.printer_Canon_Inkjet_MP610_series.print_unwriteable_margin_bottom: 0 print.printer_Canon_Inkjet_MP610_series.print_unwriteable_margin_left: 0 print.printer_Canon_Inkjet_MP610_series.print_unwriteable_margin_right: 0 print.printer_Canon_Inkjet_MP610_series.print_unwriteable_margin_top: 0 print.printer_Canon_MP610_series_Printer.print_bgcolor: false print.printer_Canon_MP610_series_Printer.print_bgimages: false print.printer_Canon_MP610_series_Printer.print_colorspace: print.printer_Canon_MP610_series_Printer.print_command: print.printer_Canon_MP610_series_Printer.print_downloadfonts: false print.printer_Canon_MP610_series_Printer.print_duplex: 472 print.printer_Canon_MP610_series_Printer.print_edge_bottom: 0 print.printer_Canon_MP610_series_Printer.print_edge_left: 0 print.printer_Canon_MP610_series_Printer.print_edge_right: 0 print.printer_Canon_MP610_series_Printer.print_edge_top: 0 print.printer_Canon_MP610_series_Printer.print_evenpages: true print.printer_Canon_MP610_series_Printer.print_footercenter: print.printer_Canon_MP610_series_Printer.print_footerleft: &PT print.printer_Canon_MP610_series_Printer.print_footerright: &D print.printer_Canon_MP610_series_Printer.print_headercenter: print.printer_Canon_MP610_series_Printer.print_headerleft: &T print.printer_Canon_MP610_series_Printer.print_headerright: &U print.printer_Canon_MP610_series_Printer.print_in_color: true print.printer_Canon_MP610_series_Printer.print_margin_bottom: 0.5 print.printer_Canon_MP610_series_Printer.print_margin_left: 0.5 print.printer_Canon_MP610_series_Printer.print_margin_right: 0.5 print.printer_Canon_MP610_series_Printer.print_margin_top: 0.5 print.printer_Canon_MP610_series_Printer.print_oddpages: true print.printer_Canon_MP610_series_Printer.print_orientation: 0 print.printer_Canon_MP610_series_Printer.print_page_delay: 50 print.printer_Canon_MP610_series_Printer.print_paper_data: 9 print.printer_Canon_MP610_series_Printer.print_paper_height: 11.00 print.printer_Canon_MP610_series_Printer.print_paper_name: print.printer_Canon_MP610_series_Printer.print_paper_size_type: 0 print.printer_Canon_MP610_series_Printer.print_paper_size_unit: 1 print.printer_Canon_MP610_series_Printer.print_paper_width: 8.50 print.printer_Canon_MP610_series_Printer.print_plex_name: print.printer_Canon_MP610_series_Printer.print_resolution: 287099472 print.printer_Canon_MP610_series_Printer.print_resolution_name: print.printer_Canon_MP610_series_Printer.print_reversed: false print.printer_Canon_MP610_series_Printer.print_scaling: 1.00 print.printer_Canon_MP610_series_Printer.print_shrink_to_fit: true print.printer_Canon_MP610_series_Printer.print_to_file: false print.printer_Canon_MP610_series_Printer.print_unwriteable_margin_bottom: 0 print.printer_Canon_MP610_series_Printer.print_unwriteable_margin_left: 0 print.printer_Canon_MP610_series_Printer.print_unwriteable_margin_right: 0 print.printer_Canon_MP610_series_Printer.print_unwriteable_margin_top: 0 privacy.donottrackheader.enabled: true privacy.sanitize.migrateFx3Prefs: true security.warn_viewing_mixed: false storage.vacuum.last.index: 1 storage.vacuum.last.places.sqlite: 1413830389 webgl.disabled: true

Important Locked Preferences


Incremental GC: true


Activated: false Prevent Accessibility: 0

Library Versions

NSPR Expected minimum version: 4.10.7 Version in use: 4.10.7

NSS Expected minimum version: 3.17.1 Basic ECC Version in use: 3.17.1 Basic ECC

NSSSMIME Expected minimum version: 3.17.1 Basic ECC Version in use: 3.17.1 Basic ECC

NSSSSL Expected minimum version: 3.17.1 Basic ECC Version in use: 3.17.1 Basic ECC

NSSUTIL Expected minimum version: 3.17.1 Version in use: 3.17.1

Experimental Features

Did you restart Firefox after you changed the configuration value?

@philipp: Here are my troubleshooting info in FF3. No malware detected by both adwcleaner or malwarebytes. Hope this helps.


 "application": {
   "name": "Firefox",
   "version": "33.0.2",
   "userAgent": "Mozilla/5.0 (Windows NT 6.1; WOW64; rv:33.0) Gecko/20100101 Firefox/33.0",
   "supportURL": "",
   "numTotalWindows": 1,
   "numRemoteWindows": 0
 "crashes": {
   "submitted": [],
   "pending": 0
 "modifiedPreferences": {
   "browser.cache.disk.capacity": 358400,
   "browser.cache.disk.smart_size.first_run": false,
   "browser.cache.frecency_experiment": 2,
   "browser.places.smartBookmarksVersion": 7,
   "browser.sessionstore.upgradeBackup.latestBuildID": "20141027150301",
   "browser.startup.homepage_override.mstone": "33.0.2",
   "browser.startup.homepage_override.buildID": "20141027150301",
   "dom.mozApps.used": true,
   "extensions.lastAppVersion": "33.0.2",
   "gfx.direct3d.last_used_feature_level_idx": 0,
   "media.gmp-gmpopenh264.lastUpdate": 1414534837,
   "media.gmp-gmpopenh264.version": "1.1",
   "media.gmp-manager.lastCheck": 1414534836,
   "network.cookie.prefsMigrated": true,
   "places.history.expiration.transient_current_max_pages": 104858,
   "plugin.state.npvlc": 0,
   "plugin.disable_full_page_plugin_for_types": "application/pdf",
   "": 0,
   "plugin.importedState": true,
   "privacy.sanitize.migrateFx3Prefs": true
 "lockedPreferences": {},
 "graphics": {
   "numTotalWindows": 1,
   "numAcceleratedWindows": 1,
   "windowLayerManagerType": "Direct3D 11",
   "windowLayerManagerRemote": true,
   "adapterDescription": "ATI Mobility Radeon HD 5470      ",
   "adapterVendorID": "0x1002",
   "adapterDeviceID": "0x68e0",
   "adapterRAM": "512",
   "adapterDrivers": "atiumd64 atidxx64 atidxx64 atiumdag atidxx32 atidxx32 atiumdva atiumd6a atitmm64",
   "driverVersion": "8.672.3.0",
   "driverDate": "11-11-2009",
   "adapterDescription2": "",
   "adapterVendorID2": "",
   "adapterDeviceID2": "",
   "adapterRAM2": "",
   "adapterDrivers2": "",
   "driverVersion2": "",
   "driverDate2": "",
   "isGPU2Active": false,
   "direct2DEnabled": true,
   "directWriteEnabled": true,
   "directWriteVersion": "6.2.9200.16571",
   "clearTypeParameters": "Gamma: 2200 Pixel Structure: R ClearType Level: 100 Enhanced Contrast: 50 ",
   "webglRenderer": "Google Inc. -- ANGLE (ATI Mobility Radeon HD 5470       Direct3D9Ex vs_3_0 ps_3_0)",
   "info": {
     "AzureCanvasBackend": "direct2d",
     "AzureSkiaAccelerated": 0,
     "AzureFallbackCanvasBackend": "cairo",
     "AzureContentBackend": "direct2d"
 "javaScript": {
   "incrementalGCEnabled": true
 "accessibility": {
   "isActive": false,
   "forceDisabled": 0
 "libraryVersions": {
   "NSPR": {
     "minVersion": "4.10.7",
     "version": "4.10.7"
   "NSS": {
     "minVersion": "3.17.1 Basic ECC",
     "version": "3.17.1 Basic ECC"
   "NSSUTIL": {
     "minVersion": "3.17.1",
     "version": "3.17.1"
   "NSSSSL": {
     "minVersion": "3.17.1 Basic ECC",
     "version": "3.17.1 Basic ECC"
   "NSSSMIME": {
     "minVersion": "3.17.1 Basic ECC",
     "version": "3.17.1 Basic ECC"
 "userJS": {
   "exists": false
 "extensions": [
     "name": "avast! Online Security",
     "version": "9.0.2021.112",
     "isActive": false,
     "id": ""
     "name": "Soda PDF 5 Converter For Firefox",
     "version": "1.0",
     "isActive": false,
     "id": ""
 "experiments": []


@gberche, thank you very much! mozilla's enigneers are actively working on the issue. what you could do on your end is to update your graphics drivers through and try it with layers.offmainthreadcomposition.enabled = true again.

@dwarde_2000, your issue looks different. it is probably better if you open a new question about it and shortly describe the symptoms you are having. thank you!

@philipp, my graphics card is an ATI Mobility Radeon HD 5470, running within an acer aspire 5740G with an intel processor.

How is that related to AMD video driver you're suggesting to update?

@gberche: ati has been taken over by amd a while ago. the link provided above is the latest driver available that turns up when you search for your configuration.

@philipp thanks for the clarification around ATI and AMD, I had missed that, sorry.

Unfortunately the latest AMD driver are incompatible with my acer model and result into a blue screen of death. I updated to latest acer available ones which were issued in 2009. I confirm the firefox bug still reproduce unless turning explicitly layers.offmainthreadcomposition.enabled = false

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